docs: add worklow docs

project-docs/workflow/PROJECT.md

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+# Project
+
+A project is an entity that solves a specific task.
+
+Abstractable components of multiple projects should be extracted into another new project.
+
+Node.js projects are published on NPMjs.com in the `@openstapps` group.
+
+## Structure
+
+Node.js/TypeScript based projects should employ the following structure:
+
+```
+src/                  Sources
+test/                 Test files
+lib/                  Compiled sources
+  cli.js              cli tool
+  index.js            API (classes, function, constants, ...)
+  index.d.ts          TypeScript definitions for API
+.editorconfig
+.gitignore            List of files that should be ignored by git
+.npmignore            List of files that should be ignored by npm
+package.json          Package description
+package-lock.json     Meta file, that fixates dependencies
+README.md             Description of project, entry point for documentation
+tsconfig.json         TypeScript configuration
+tslint.json           TSLint configuration
+```
+
+### `@openstapps/configuration`
+
+For the contents and purpose of `.editorconfig`, `tsconfig.json` and `tslint.json` refer to `@openstapps/configuration`.
+
+## Further resources
+
+* [Coding style](CODING.md)
+* [Versioning](VERSIONING.md)